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not sure what's going on here then... PCSX2 doesn't just decide to use more CPU, there is either something on the computer has changed which caused it (other software instaleld or the updated drivers, which rolling back should fix if this is the case) or PCSX2's settings have been changed, possibly added extra clamping modes or something.
one thing you could try is backing up your pcsx2 ini files, deleting them all and setting everything up again and see if the issue persists.
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okay i'll try it the only thing i updated is my gpu driver i think i'll try to roll it back and delete those .ini files you said
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btw when did u update your gpu driver? if it's recently then just do a system restore to a restore point which is BEFORE when u did the update. things will return to as they were before. if too much time has passed then that restore point will be gone thus u have to manually roll back. if that doesn't work u can try backing up your data, formatting your machine and installing everything once again
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i updated my gpu driver last October 10, and everything on nvidia control panel is on default for pcsx2( no AA or AF or vsync turned on on the control panel) except i turned it to maximum performance
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as long as it started on 60fps that means things are ok
describe the slowdown. does it stay at 20 fps? or does it fluctuate between 60 fps and 20 fps? if fluctuate then it's ok. i also got speed fluctuations when i played final fantasy 10
when you start the emulator at 60 fps after how long does it drop to 20 fps? like in say an hour? in hour the laptop would have heated up and that may cause the slowdown. removing the battery will not stop the overheating. try getting a good coolpad and use it when u are playing